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Oct 14, 2017 at 3:33 comment added DanielSank Negative frequency comes up all the time in signal processing and various areas of physics that are way simpler than QFT. It's really funny how people who know QFT think so many simple mathematical issues are only relevant in QFT. Another example is moving poles of a Green's function off of the real line. See here.
Oct 14, 2017 at 2:33 history answered Tom Csiz CC BY-SA 3.0